EP4149851A1 - Boîte de conserve métallique comprenant un corps de boîte métallique et un couvercle métallique, assemblés par une languette pelable - Google Patents
Boîte de conserve métallique comprenant un corps de boîte métallique et un couvercle métallique, assemblés par une languette pelableInfo
- Publication number
- EP4149851A1 EP4149851A1 EP21724296.5A EP21724296A EP4149851A1 EP 4149851 A1 EP4149851 A1 EP 4149851A1 EP 21724296 A EP21724296 A EP 21724296A EP 4149851 A1 EP4149851 A1 EP 4149851A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- roll
- strip
- sealing
- peelable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
- B65D7/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of curved cross-section, e.g. cans of circular or elliptical cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/02—Removable lids or covers
- B65D43/0202—Removable lids or covers without integral tamper element
- B65D43/0214—Removable lids or covers without integral tamper element secured only by friction or gravity
- B65D43/022—Removable lids or covers without integral tamper element secured only by friction or gravity only on the inside, or a part turned to the inside, of the mouth of the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D55/00—Accessories for container closures not otherwise provided for
- B65D55/02—Locking devices; Means for discouraging or indicating unauthorised opening or removal of closure
- B65D55/06—Deformable or tearable wires, strings, or strips; Use of seals, e.g. destructible locking pins
- B65D55/08—Annular elements encircling container necks
- B65D55/0818—Destructible or permanently removable bands, e.g. adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00018—Overall construction of the lid
- B65D2543/00064—Shape of the outer periphery
- B65D2543/00074—Shape of the outer periphery curved
- B65D2543/00092—Shape of the outer periphery curved circular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00018—Overall construction of the lid
- B65D2543/00259—Materials used
- B65D2543/00277—Metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00444—Contact between the container and the lid
- B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
- B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
- B65D2543/00509—Cup
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2543/00—Lids or covers essentially for box-like containers
- B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
- B65D2543/00953—Sealing means
- B65D2543/00962—Sealing means inserted
- B65D2543/00972—Collars or rings
Definitions
- Metal tin can comprising a metal can body and a metal lid, assembled by a peel-off tab
- the present invention relates to the technical field of metal cans.
- metal cans comprising a metal can body and a metal cover adapted to close an access opening of said can body, assembled by a peelable tab.
- Metal cans are commonly used for packaging foodstuffs. Such cans can also be used for packaging other industrial products, such as paints.
- Some metal cans include:
- a metal box body comprising a side wall, a first end of which is connected to a bottom and a second end of which delimits an access opening, which second end has a roll which ends in a free border
- metal cover adapted to close said access opening, which metal cover comprises a peripheral skirt which comprises an interlocking strip adapted to cooperate by interlocking with said second end of the side wall, and
- Metal parts typically have a protective coating (eg varnish) to make them inert to chemical reactions, especially with the contents.
- a protective coating eg varnish
- the free edge of metal parts is often very sharp, with a significant risk of cuts for the user handling the can.
- This roll is generally achieved by winding the material on itself.
- This free edge generates a second problem: due to the manufacturing process, the metal of this same free edge is bare (uncoated / coated, for example free of varnish).
- this free edge is then likely to interact chemically with the contents of the tin can, then leading to possible corrosion and / or sulphurization phenomena liable to contaminate this content and to render the contents of the can. 'unacceptable visual appearance by this contamination with a dark deposit on the tin can and / or on the product.
- a solution suitable for protecting the free edge of the roll so as to avoid the phenomena of chemical reactions liable to occur at this free edge of the roll.
- the present invention provides a novel tin can structure comprising a canister body and a metal cover, assembled by a peelable tab.
- a metal tin can comprising:
- a metal box body comprising a side wall, a first end of which is connected to a bottom and a second end of which delimits an access opening, which second end has a roll which ends in a free border
- metal cover adapted to close said access opening, which metal cover comprises a peripheral skirt which comprises an interlocking strip adapted to cooperate by interlocking with said second end of the side wall, and
- the roll of said second end of the side wall faces outwardly, away from the access opening.
- said peelable tab has a strip which partially covers said roll, sealingly, to seal said metal tin can.
- the present invention provides a novel metal tin can structure whose free edge of metal parts is protected against chemical interactions with the contents of the tin can (thus avoiding corrosion and / or sulfurization problems).
- the roll of the can body is isolated from the contents of the can thanks to the peelable tab.
- this peelable tab thus prevents interactions between the free edge of the can body and the contents of the can.
- This solution is therefore particularly effective in preventing chemical reactions between the free edge of the can body and the environment (in particular the contents of the can).
- the peelable tab is sealed by means of two sealing zones, annular, namely:
- the lower sealing zone covers the roll and / or a sealing strip, advantageously of constant circular or oblong section, connected to said roll.
- the lower sealing zone comprises a configuration chosen from:
- the roll comprises an interior portion, located on the side of the access opening, and an exterior portion, located opposite said interior portion and connected to the free edge;
- the peelable tab optionally via the lower sealing area, is sealed with said outer portion or the peelable tab has a lower first sub-band which is in sealing contact with at least a part of the outer portion of the roll (preferably , the outer portion of the roll defines a protruding dimension with respect to an intermediate segment extending between the lower sealing zone and the upper sealing zone);
- the peelable tongue comprises a curved strip which conforms to at least part of the outer portion of the roll; more preferably, the inner portion and the outer portion of the roll are curved or parallel to each other, where appropriate, the parallel portions each extend parallel to a longitudinal axis or at an angle relative to the longitudinal axis, the dimensions of which in section decrease in a direction oriented towards the bottom of the box body or the dimensions of which in section increase in a direction oriented towards the bottom of the box body;
- the second end of the side wall comprises an end strip, advantageously a constant circular or oblong section, connected to said roll, and said end strip and said roll define identical external dimensions, or at least approximately identical, with respect to each other or said outer portion of the roll protruding from the end strip; of preferably the end band and the roll are connected by a constricted portion, oriented towards the side of the access opening;
- the interlocking strip has a concave surface which is complementary to at least part of the roll, if necessary at least of its inner portion; preferably, at the level of the metal cover, the sealing strip is connected to the interlocking strip to come in the extension of the roll and to cooperate with the peelable tab through the upper sealing zone;
- the sealing strip has a vertical section parallel to the longitudinal axis 3 ', for example cylindrical or oblong parallelepiped, or with an angle with respect to the longitudinal axis 3', the dimensions of which in section increase in a direction oriented towards the bottom of the box body or whose cross-sectional dimensions decrease in a direction directed towards the bottom of the box body;
- the metal cover comprises a disc extended by the peripheral skirt which extends from the side of an upper face of said disc;
- the metal tin can comprises a seal, optionally formed by an annular sealing zone, which is formed between adjoining surfaces of said second end of the side wall and of said interlocking strip of the metal cover;
- the peelable tab is associated with an elongated member, which is provided, if necessary, between the two sealing zones, to allow the division of said peelable tongue by means of a traction applied to said elongated member;
- the bottom of the metal box body is made in one piece with the side wall, or attached to the side wall;
- the peelable tongue and the roll together define an overlying chamber and / or an underlying chamber, which chambers are filled, over at least part of the circumference, with a filling seal.
- the present invention also relates to the method for manufacturing a metal tin can according to the invention, which manufacturing method comprises:
- the metal box body comprising a side wall, a second end of which delimits an access opening, which second end comprises a roll which ends in a free edge and which is oriented outwards, opposite to the access opening,
- said metal cover is positioned at the level of said access opening of the metal box body, and - the metal cover is sealed at the access opening of the metal box body, by heat sealing said peelable tab on the circumference of the peripheral skirt of the metal cover and the second end of the side wall of the box body metallic.
- the first end of the box body has a bottom or has a free border delimiting an access opening
- the peelable tab is heat-sealed in a single step or in at least two successive steps;
- the peelable tab is sealed with at least one support tool comprising a relief conforming to at least part of the roll.
- FIG. 1 is a general view, along a vertical sectional plane, of a metal tin according to the invention
- FIG. 2 is an enlarged view of detail II in figure 1, showing in more detail the assembly between the can body and the metal cover, locked together by the peel tab, with the can body ending in a roll oblong section;
- FIG. 3 is a very schematic view which illustrates a possible arrangement of the sealing zones with the lower sealing zone covering the roll and an underlying sealing strip;
- FIG. 4 is a very schematic view which illustrates a possible arrangement of the sealing zones with the lower sealing zone covering an underlying sealing strip of the roll;
- FIG. 5 is a schematic view which illustrates a filling of the chambers, defined by the peelable tongue and the roll, with a filling seal;
- FIG. 6 is a very schematic view which illustrates a possible arrangement of the sealing zones with the lower sealing zone covering only the roll
- FIG. 7 is an enlarged view of detail II in FIG. 1, showing in more detail a variant of the assembly of the can body and metal cover, locked by the peelable tab, with the can body ending in a rolled up. circular section;
- FIG. 8 is a view similar to FIG. 7, in which the peelable tongue comprises a curved strip which conforms to at least part of the outer portion of the roll;
- FIG. 9 is a schematic view showing a box body disposed alongside a combination of support tools for sealing the peel-off tab;
- FIG. 10 is a schematic view which shows a support tool comprising a relief conforming to at least part of the roll;
- FIG. 11 is an enlarged view of detail II in FIG. 1, showing in more detail an alternative embodiment of the canister body and the metal cover, locked together by the peelable tab;
- FIG. 12 is an enlarged view of detail II in FIG. 1, showing in more detail also an alternative embodiment of the canister body and the metal cover, locked together by the peelable tab;
- FIG. 13 is an enlarged view of detail II in Figure 1, showing in more detail yet another alternative embodiment of the canister body and the metal cover, locked together by the peel tab.
- the metal tin can 1 according to the invention, illustrated in particular in Figures 1 and 2, comprises:
- a metal box body 2 (also called “box body 2") comprising a side wall 21 connected to a bottom 22 and having an access opening 23,
- a metal cover 3 (also called “cover 3") adapted to cooperate by interlocking with the side wall 21 of said metal box body 2 to close said access opening 23, and
- the metal tin can 1 is shaped so that the peelable tab 4 prevents interactions between the free edge of the can body 2 and the contents of the tin can 1.
- the metal box body 2 therefore comprises a side wall 21, defining a longitudinal axis 2 ’, delimited by two ends:
- the side wall 21 may for example have a generally cylindrical or parallelepiped / oblong shape.
- the side wall 21 and the bottom 22 can be in one piece.
- the bottom 22 is attached to the side wall 21, for example by crimping.
- the second end 212 of the side wall 21 (opposite the bottom 22) has a roll 25 which ends in a free edge 251.
- the free edge 251 can be made of a metal which is not covered; this free edge 251 is then capable of chemically interacting with the contents of the tin can 1, with possible corrosion and / or sulfurization phenomena.
- rolled is meant in particular a winding of the material on itself.
- This roll 25 advantageously has, seen from above, a general shape identical to the side wall 21, for example a generally circular or oblong shape.
- the roll 25 of this second end 212 of the side wall 21 is oriented (also called “rolled up”) towards the outside (of the tin can 1), opposite the opening of access 23 (and from the longitudinal axis 2 ').
- the roll 25 can thus be divided into at least two portions:
- the inner portion 255 and the outer portion 256 of the roll 25 may be mutually parallel, advantageously rectilinear / straight, and connected by a curved portion, thus defining a section of oblong shape (FIG. 2 in particular).
- the interior 255 / exterior 256 portions, parallel, may extend:
- the dimensions of the horizontal section decrease in a direction oriented towards the bottom 22 of the box body 2.
- the dimensions of the horizontal section increase in a direction oriented towards the bottom 22 of the box body 2 (reverse inclination in FIG. 11).
- the inner portion 255 and the outer portion 256 of the roll 25 may be curved ( Figures 7 and 8).
- the roll 25 then has a section of generally circular or cylindrical shape.
- the free edge 251 is protected within the roll 25.
- This protection aims to prevent contact by the user with this free edge 251, so as to eliminate the risk of cuts which result therefrom.
- this free edge 251 is advantageously curved between the inner portion 255 and the outer portion 256 of the roll 25.
- the second end 212 may also include an end strip 26, advantageously of constant horizontal circular or oblong section (perpendicular to the longitudinal axis 2 '), connected to the roll 25. This end strip 26 is thus underlying the rolled 25.
- This end strip 26 advantageously has a general shape identical to the side wall 21, for example a generally cylindrical or parallelepiped / oblong shape.
- This end strip 26 advantageously forms a sealing strip 26, which can be sealed with the peelable tab 4.
- the second end 212 of the side wall 21 (via the roll 25 and / or the end strip 26) is advantageously intended to be sealed with a lower strip 41 of the peelable tab 4.
- This end strip 26 and said roll 25 (in particular its outer portion 256) advantageously define identical, or at least approximately identical, outer dimensions with respect to each other.
- end strip 26 and the roll 25 are advantageously connected by a recessed portion 27, oriented towards the side of the access opening 23.
- This constricted portion 27 thus approaches the longitudinal axis 2 ’, relative to the end strip 26.
- the outer portion 256 of the roll 25 advantageously extends in the extension of the end strip 26; the inner portion 255 of the roll 25 is constricted with respect to this end strip 26.
- the outer size of the roll 25 (in particular of its outer portion 256) is greater than the outer size of the end strip 26.
- the outer portion 256 of the roll 25 advantageously extends projecting from the end strip 26; the inner portion 255 of the roll 25 may be constricted with respect to this end strip 26.
- the metal cover 3 is adapted to close the access opening 23.
- This metal cover 3 comprises a peripheral skirt 31, defining a longitudinal axis 3 ’, which comprises:
- the interlocking strip 311 advantageously has a general shape identical to the roll 25 of the box body 2, for example a generally circular or oblong shape.
- the interlocking strip 311 comprises a concave surface 311a (outer), here male, which is complementary to at least part of the roll 25 of the box body 2, where appropriate at least of its inner portion 255, here female.
- the sealing strip 312 of this metal cover 3 advantageously has a general shape identical to the side wall 21 of the box body 2, for example a generally cylindrical or parallelepiped / oblong shape.
- This sealing strip 312 (overlying) is preferably connected to the interlocking strip 311 (underlying) and extends in the extension of the roll 25 of the box body 2 (see in the outline of the strip end 26 of the gearbox body 2).
- the interlocking strip 311 then forms a constriction with respect to the sealing strip 312.
- This sealing strip 312 of the metal cover 3 then cooperates advantageously with the peelable tab 4 by means of an upper sealing zone 52 described below.
- the sealing strip 312 has a vertical section:
- the dimensions of the horizontal section increase in a direction facing the bottom 22 of the box body 2 - from top to bottom ( Figure 11); alternatively, the dimensions of the horizontal section decrease in a direction oriented towards the bottom 22 of the box body 2 - from top to bottom (not shown).
- the metal cover 3 comprises a disc 34 (lower) extended by the peripheral skirt 31.
- This disc 34 has two opposite faces:
- peripheral skirt 31 then advantageously extends from the side of the upper face 342 of the disc 34, together to form a metal cover 3 in the form of a cup.
- the disc 34 and the interlocking strip 311 are here connected by an annular molding 35 which is oriented towards the side of the lower face 341 (projecting from the side of the lower face 341).
- This metal cover 3 is advantageously produced by forming operations of a metal sidewall.
- peripheral skirt 31 ends in a roll 37 (upper) opposite the disc 34.
- roll 37 upper
- the term “rolled” is understood to mean in particular a winding of the material on itself.
- This roll 37 advantageously has, seen from above, a general shape identical to the peripheral skirt 31, for example a generally circular or oblong shape.
- the roll 37 is here oriented (also called “rolled up”) outward (of the tin can 1), away from the disc 34 (and the longitudinal axis 2 ’).
- the roll 37 is oriented (also called “rolled up") towards the inside (of the tin can 1), facing the disc 34 (and the longitudinal axis 2 ’).
- Such an embodiment would reduce the radial size of the metal cover 3.
- the peelable tab 4 ensures (or at least “participates in”) the assembly, advantageously hermetic (to fluids, including gases and liquids), between the metal cover 3 and the side wall 21 of the box body 2.
- This peelable tab 4 is therefore sealed, by a heat-bonding material T (illustrated diagrammatically in particular in FIG. 3), on the circumference of the peripheral skirt 31 of the metal cover 3 and of the second end 212 of the side wall 21 of the body of box 2.
- a heat-bonding material T illustrated diagrammatically in particular in FIG. 3
- the peelable tab 4 can be chosen from the peelable tabs 4 which are conventional per se.
- the peelable tongue 4 comprises several layers:
- base layer also called “barrier layer”, outer, made of a resistant and flexible material, for example aluminum, and
- the base layer advantageously has a mechanical structural function (resistance of the two metal parts 2, 3 during sterilization against pressure, preventing untimely perforation, etc.).
- This base layer has, for example, an aluminum thickness ranging from 20 to 100 ⁇ m.
- the sealing layer can be made up of different sublayers (not shown), namely:
- an adhesive sub-layer consisting for example of polypropylene grafted with maleic anhydride and having a thickness of 2 to 15 micrometers
- a peel sub-layer consisting for example of a mixture of polyethylene and polypropylene, having a thickness of 15 to 80 micrometers.
- this peelable tab 4 may also include a gripping or traction tab (not shown), intended to facilitate the separation of the peelable tab 4 from the metal parts 2, 3 by the consumer.
- the term “peelable tongue 4” is understood to mean in particular an elongated member, advantageously of rectangular outline, delimited in particular by:
- This peelable tab 4 advantageously extends over the entire circumference, and continuously, of the metal cover 3 / box body 2 pair.
- this peelable tab 4 advantageously extends in a plane perpendicular to the longitudinal axis 2 ’, 3’ of the metal cover 3 / box body 2 pair.
- the peelable tongue 4 comprises at least one strip 41 (or portion of width) which partially covers, and in a leaktight manner (to fluids), the roll 25 of this second end 212 of the side wall 21 of the body. box 2.
- This strip 41 thus interacts with the roll 25 to prevent any fluid circulation between the peelable tab 4 and the roll 25, ensuring the tightness of the metal tin can 1, advantageously both with regard to incoming flows and to outgoing flows. .
- the peelable tongue 4 advantageously comprises several strips (or portions of width) superimposed:
- the lower strip 41 of the peelable tongue 4 then has a width suitable for covering the roll 25 and, preferably, the sealing strip 26.
- the strips 41, 42 of this peelable tongue 4 advantageously extend in planes perpendicular to the longitudinal axis 2 ', 3' of the metal cover 3 / box body 2 pair, parallel to the longitudinal edges 4a of this peelable tongue 4.
- the peelable tab 4 is sealed with the metal cover 3 / box body 2 pair by means of two sealing zones 5, annular, which are made in the heat-bonding material T, namely: - a lower sealing zone 51 which is interposed between, on the one hand, the lower strip 41 of the peelable tongue 4 and, on the other hand, the second end 212 of the side wall 21 of the box body 2, and
- the lower sealing zone 51 advantageously covers:
- the lower sealing zone 51 advantageously comprises a configuration chosen from:
- the first lower sub-band 411 of the peelable tongue 4 cooperates with the roll 25 by means of a sealed contact (without sealing by the heat-bonding material T).
- the outer portion 256 of the roll 25 defines a protruding dimension C (advantageously maximum) with respect to an intermediate segment S extending between the zone of lower seal 51 and the upper seal zone 52.
- this intermediate segment S extends between the upper outlet (or ball point) of the lower sealing zone 51 and the lower exit (or ball point) of the upper sealing zone 52.
- the intermediate segment S corresponds to the height dimension of the first lower sub-band 411.
- the protruding dimension C is measured perpendicular to the intermediate segment S.
- This dimension is projection C is preferably greater than 0 mm, preferably greater than 0.2 mm, or even ranging from 0.2 mm to 2 mm, optionally from 0.2 mm to 1 mm.
- the first lower sub-band 411 is advantageously protruding (or convex) with respect to the second lower sub-band 412 of the peelable tab 4 which forms the single sealing zone 512 and with respect to the band upper 42.
- the first lower sub-band 411 is held in tension, deformed outwardly, by the curl 25.
- Such an embodiment makes it possible to dispense with the sealing on the roll 25 of the box body 2: the relative position of the roll 25 allows “self-sealing” by the contact established during the sealing of the metal cover and which is maintained ( or even increasing) during an increasing pressure delta.
- the lower sealing zone 51 further comprises a first sealing sub-zone 511, partially covering the "protruding" roll 25, at the level of the first lower sub-band 411 of the peelable tongue 4.
- these sealing zones 5 advantageously extend over the entire circumference, and continuously, of the metal cover 3 / box body 2 pair.
- these sealing zones 51, 52 advantageously extend in a plane perpendicular to the longitudinal axis 2 ", 3" of the metal cover 3 / box body 2 pair.
- the peelable tongue 4 where appropriate via the lower sealing zone 51, is sealed with the outer portion 256 of the roll 25.
- the peelable tongue 4 advantageously faces (preferably heat-sealed to) a face of the roll 25 coming in the extension of an inner face 21a of the side wall 21 which is oriented towards the outside due to the fact winding of the roll 25.
- the peelable tongue 4 may have a rectilinear section or one composed of several straight segments.
- the first lower sub-band 411 of the peelable tongue 4, partially covering the roll 25, may be rectilinear (FIGS. 3 and 7 in particular).
- the lower band 41 conforms to at least part of the outer portion 256 of the roll 25 (FIG. 8 in particular).
- this lower band 411 then has a curved shape, with a vertical section in an arc of a circle, forming a curved band 411.
- This embodiment aims to optimize the contact surface between the first lower sub-band 411 of the peelable tongue 4 and the outer portion 256 of the roll 25.
- heat-sealing material T is also called “heat-sealing material”.
- heat-bonding material is also meant a material capable of being activated to provide a sealing (or bonding) function when it is subjected to heating (for example local heating by conduction or induction).
- This heat-sealing material is for example chosen from polypropylene or polyethylene (for example in the form of a heat-sealing varnish which advantageously consists of a polymer matrix and a dispersion of polypropylene).
- the opening of the tin can 1 will advantageously consist of exerting traction on the peelable tab 4 at a free portion forming a gripping / traction member (not shown).
- the peelable tab 4 gradually detaches from the circumference of the tin can 1 by a propagation of the degradation of the sealing zones 5.
- the metal cover 3 is released and can be separated from the metal box body 2.
- the peelable tongue 4 can be associated with (or even integrate) an elongated member 45 to allow the division / tearing of this peelable tongue 4 by means of a traction applied to said elongated member 45.
- Such an elongated member 45 consists, for example, of a wire incorporated in the thickness of the peelable tab 4.
- this elongated member 45 is advantageously arranged between the two sealing zones 5 (the lower sealing zone 51 and the upper sealing zone 52) to divide the peelable tab 4 into a lower strip 41 and an upper strip 42.
- the metal tin can 1 can also comprise a seal 6, optionally formed by an annular sealing zone, which is formed between the adjoining surfaces, on the one hand, of the second end 212 of the side wall 21 of the box body 2 and, on the other hand, of the interlocking strip 311 of the metal cover 3.
- This seal 6 thus aims to participate in the fluidic sealing (including gas and liquid) of the metal tin can 1, in addition to the peelable tab 4. Still generally, as described below in relation to FIG. 5, the peelable tongue 4 and the roll 25 can together define at least one chamber 7:
- the chambers 7 are filled, over at least part of the circumference, with a filling seal 8.
- the filling seal 8 in the underlying chamber 72 participates in the sealing of the roll 25 and the protection of the free edge 251.
- FIG. 3 illustrates a box body 2 comprising a roll 25 with an oblong section and a peelable tab 4 attached to the box body 2 by two sealing sub-areas 511, 512 (a first sealing sub-area 511 covering partially the roll 25 and a second sealing sub-area 512 covering the sealing strip 26 of the can body 2);
- FIG. 4 illustrates a box body 2 comprising a roll 25 with an oblong section and a peelable tab 4 attached to the box body 2 by a single sealing zone 512 covering the sealing strip 26 only;
- FIG. 5 illustrates a box body 2 comprising a roll 25 with an oblong section and a peelable tab 4 attached with the lower sealing zone 51 covering the roll 25 and / or the sealing strip 26, and the chambers 7 of which are filled through the filling seal 8;
- FIG. 6 illustrates a box body 2 comprising a roll 25 with an oblong section and a peelable tab 4 attached to the box body 2 by a single sealing zone 511, partially covering the roll 25, only (the peelable tab 4 covers only the roll 25, without going down to the sealing strip 26);
- - Figure 7 illustrates a box body 2 comprising a roll 25 of circular section and a peelable tab 4 added so that the lower sealing zone 51 covers the roll 25 and / or the sealing strip 26 and that the first sub- lower band 411 is tangent to the roll 25 of the box body 2;
- - Figure 8 illustrates a box body 2 comprising a roll 25 of circular section and a peelable tab 4 added so that the lower sealing zone 51 covers the roll 25 and / or the sealing strip 26 and that the first sub- lower band 411 conforms to the curl 25 of the box body 2;
- FIG. 11 illustrates a box body 2 comprises an oblong roll 25 (dimensions in section decreasing towards the bottom of the box body 2) and a cover 3 comprising an oblong sealing strip 312 (dimensions in section increasing towards the disc 34 of this metal cover 3);
- Figure 12 illustrates a variant of Figure 4, in which the outer portion 256 of the roll 25 is curved and protrudes from the end strip 26;
- FIG. 13 illustrates a variant of Figure 11, in which the outer portion 256 of the roll 25 is flat and protrudes from the end strip 26.
- the present invention also relates to the process for manufacturing the metal tin can according to the invention.
- This manufacturing process comprises:
- the metal box body 2 comprising a side wall 21, a second end 212 of which delimits an access opening 23, which second end 212 comprises a roll 25 which ends in a free edge 251 and which is oriented towards the outside, opposite the access opening 23,
- said metal cover 3 is positioned at said access opening 23 of the metal box body 2, and
- the metal cover 3 is sealed at the level of the access opening 23 of the metal box body 2, by heat sealing the peelable tab 4 on the circumference of the peripheral skirt 31 of the metal cover 3 and of the second end 212 of the side wall 21.
- the first end 211 of the box body 2 may include a bottom 22.
- the filling of this box body 2 is carried out before the step of closing by the metal cover 3.
- the first end 211 of the box body 2 may include a free edge delimiting a second access opening.
- the filling of the box body 2 is advantageously carried out after the step of closing by the metal cover 3.
- the bottom 22 is then attached, for example by crimping, to the level of the first end 211 of the body. box 2 to finish the tin can 1.
- At least one of the chambers 7 is advantageously filled with the filling seal 8.
- the peelable tab 4 is heat-sealed / heat-sealed in a single step or in at least two successive steps (with advantageously at least one heat-sealing / heat-sealing step per sealing zone 5).
- Heat sealing is advantageously activated by combined actions of heat and pressure.
- the heating is advantageously carried out from the outer face 4c of the peelable tab 4, to generate the sealing zones 5 by means of a phenomenon of thermal conduction or induction.
- the heat sealing of the peelable tab 4 can be obtained by means of a series of support tools 9 which are each dedicated to a sealing zone 5.
- a third support tool 93 intended for heat sealing the first sealing sub-zone 511 of the lower sealing zone 51 (partially covering the roll 25).
- these support tools 9 are implemented successively so as to heat-seal the successive sealing zones 5 from top to bottom, or vice versa, to avoid stress on the peelable tab 4.
- Each support tool 9 has a peripheral surface adapted to match a complementary portion of the box body 2 / cover 3 pair.
- at least one support tool 93 here the third tool d. 'support 93, comprises a relief 931 (for example a groove) conforming to at least part of the roll 25.
- Such a groove advantageously corresponds, in negative, to the outer contour of the roll 25.
- the lower strip 41 of the peelable tongue 4, and in particular its first lower sub-strip 411 follows at least part of the strip. outer portion 256 of the roll 25 (FIG. 8 in particular).
- This embodiment aims to optimize the contact surface between the first lower sub-band 411 of the peelable tongue 4 and the outer portion 256 of the roll 25.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2004828A FR3110149B1 (fr) | 2020-05-15 | 2020-05-15 | Boîte de conserve métallique comprenant un corps de boîte métallique et un couvercle métallique, assemblés par une languette pelable |
PCT/EP2021/062352 WO2021228778A1 (fr) | 2020-05-15 | 2021-05-10 | Boîte de conserve métallique comprenant un corps de boîte métallique et un couvercle métallique, assemblés par une languette pelable |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4149851A1 true EP4149851A1 (fr) | 2023-03-22 |
Family
ID=71994599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21724296.5A Pending EP4149851A1 (fr) | 2020-05-15 | 2021-05-10 | Boîte de conserve métallique comprenant un corps de boîte métallique et un couvercle métallique, assemblés par une languette pelable |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4149851A1 (fr) |
FR (1) | FR3110149B1 (fr) |
WO (1) | WO2021228778A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3231078A (en) * | 1961-12-22 | 1966-01-25 | American Can Co | Easy open container with reclosure |
GB1124022A (en) * | 1964-07-22 | 1968-08-21 | Minnesota Mining & Mfg | Adhesive strip |
FR2571338A1 (fr) * | 1984-10-05 | 1986-04-11 | Cod Int Tech Sa | Emballage etanche, procede de fabrication et utilisation de cet emballage |
FR2716393B1 (fr) * | 1994-02-24 | 1996-04-12 | Lorraine Laminage | Boite métallique pour contenu démoulable constituée d'un corps et d'un couvercle métallique refermable après ouverture et procédé de fabrication d'une telle boîte. |
-
2020
- 2020-05-15 FR FR2004828A patent/FR3110149B1/fr active Active
-
2021
- 2021-05-10 EP EP21724296.5A patent/EP4149851A1/fr active Pending
- 2021-05-10 WO PCT/EP2021/062352 patent/WO2021228778A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
FR3110149A1 (fr) | 2021-11-19 |
WO2021228778A1 (fr) | 2021-11-18 |
FR3110149B1 (fr) | 2022-05-20 |
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